Pivoting device for rotating parts in weighing apparatus and the like.



-G. van POST. PIVOTING DEVICE FOR ROTATING PARTS IN WEIGHIIIIG APPARATUS AND THE LIKE. APPLICATION FILED FEB. IB. I916.

1,256,747. Patnted Feb. 19, 1918.

Fig :1.

In verfbr GusTaf r017 Paar UNITED STATES PATENT ()FF'ICE.

GUSTAF VON POST, (1F STOCKI-IOLM, SWEDEN.

PIVOTING DEVICE FOR ROTATING PARTS IN WEIGHING APPARATUS AND THE LIKE.

Application filed February 18, 1916.

To (1 reborn it army concern:

lie it ,:-:nown that I, G-u's'rar vow Pos'r,

a subject of the I "if: of Sweden, residing at 3 Blasicholn a n. Stockholm, Sweden, have in. ntcd i and useful Improvements in. Pivotr g Devins for Rotating Parts in Weighing pparatus and the like, of which the following is specification.

In weighing and similar apparatus with re ding parts, where it is of importance for the sake of sensibility that the move ueuls of said rotating parts occur under the smallest possible friction, efforts have been made to reduce the friction by various means. For instance, the pivots of the rotating parts have been IrlOlllllTGLl between rotary rollers of a comparatively large diameter. These and other means, however, are not satisfactor y even for light parts, as indexes in index weighingapparatus, and still less for dials or index drums with comparatively large dimensions.

The object of the present invention is to provide a pivoting device which operates with a. sufiiciently small amount of friction for being ap to port such weighing parts. his device is principally characterized by the fact that the rotating parts are. supported by mercury or another suitable fluid.

In the accompanying drawing, some forms of the invention are illustrated. Figure 1 shows a vertical section through a pivoting device for a vertical index dial in a dial woiglr'ng ap 'iaratus and Fig. 2 an end View of the same device. Fig. 3 shows a pivoting device for a horizontal dial. Fig. 1 shows a section through an index weighing armaratus with a. pivoting device embodylug the invention mounted therein.

In the form shown in Figs. 1 and 2, 1 is the shaft of an index dial The shaft 1 adapted to be rotated by a balance by means of a tooth wheel 3 and a tooth wheel or rack bar (not shown) cooperating therewith. Centrally on the shaft 1, there are mounted two rollers 4 which are surrounded to a certain height by vessels 5 oommunicating with each other, said vessels being adapted to be filled with mercury or another suitable fluid in such a quantity that the rollers will float freely in the vessels. The

Specification of Letters Patent.

Patented Feb. 19, 1918.

Serial No. 79,031.

fluid is poured in through a pipe 6 and can be drawn off through a pipe 7 adapted to be closed. In addition to the pipes 6 and 7, the vessels have an overflow pipe 8 which is rotatably mounted in the pipe 6 so that its mouth can be adjusted to different height.

By such adjustment the mercury level in the vessels 5 can. be easily and exactly controlled at will. In the form shown, the shaft 1 traverses openings 9 in the walls of the vessels said openings limiting the displacement of the shaft and the rollers in directions perpendicular to the shaft. In filling the vessels with mercury, the overflow pipe is so adjusted that the quantity of mercury in the vessels lifts the rollers to such an extent, that the shaft 1 is not in contact with the edges of the openings 9.

In the form shown in Fig. 3, the index dial 2 is horizontal and the shaft 1 vertical. Instead of rollers, an annular supporting body 10 is used in this instance. Ihe vessel is correspondingly annular and provided, as in Figs. 1 and 9., with a filling pipe 6, a draining pipe 7 adapted to be closed and an adjustable overflow pipe 8. The sidewise movements of the shaft- 1 are limited by a conical pivot 11 which engages a cor responding recess 12 in some stationary part. Iniilling in mercury, the overflow pipe is so adjusted that the mercury in the vessel 5 will lift the pivot 11 out of contact with the bottom of the recess 19-.

In the apparatus shown in Fig. 1, a pivotdevice of substantially the same construction as that shown in Figs. 1 and 2 is mounted in the casing 13 of the apparatus.

Having now particularly described the nature of my invention and the manner of its operation, what I claim is:

1. In weighing and similar apparatus having rotating parts, a receptacle adapted to contain fluid to support said rotating parts. and regulating means for maintaining any one of a predetermined range of levels of the fluid.

In weighing and similar apparatus having rotating parts, a receptacle adapted to contain fluid to support said rotating parts, regulating means for maintaining any one of a predetermined range of levels of the fluid, and means for limiting the move lnent of the rotating parts away from a predetermined position.

3. In Weighing and similar apparatus having rotating parts, a receptacle filled with fluid supporting said rotating parts, and an adjustable overflow outlet for said receptacle.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GUSTAF VON POST.

\Vitnesses BIRGER NoRDrnLnT ADA SIMON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

